VSPER CHEM1109

2 electron regions, 0 lone pairs (AX₂)

linear

bond angle = 180 degrees

3 electron regions, 0 lone pairs (AX₃)

trigonal planar

bond angle = 120 degrees

3 electron regions, 1 lone pair (AX₂E₁)

bent

bond angle < 120 degrees

4 electron regions, 0 lone pairs (AX₄)

tetrahedral

bond angle = 109.5 degrees

4 electron regions, 1 lone pair (AX₃E)

trigonal pyramidal

bond angle < 109.5 degrees

4 electron regions; 2 lone pairs (AX₂E₂)

bent

bond angle « 109.5 degrees

5 electron regions, 0 lone pairs (AX₅)

trigonal bipyramidal

(axial) bond angle = 90 degrees

(equatorial) bond angle = 120 degrees

5 electron regions, 1 lone pair (AX₄E₁)

see-saw

(axial) bond angle < 90 degrees

(equatorial) bond angle < 120 degrees

5 electron regions, 2 lone pairs (AX₃E₂)

T-shaped

(axial) bond angle < 90 degrees

5 electron regions, 3 lone pairs (AX₂E₃)

linear

bond angle = 180 degrees

6 electron regions, 0 lone pairs (AX₆)

octahedral

bond angle = 90 degrees

6 electron regions, 1 lone pair (AX₅E₁)

square pyramidal

bond angle < 90 degrees

6 electron regions, 2 lone pairs (AX₄E₂)

square planar

bond angle = 90 degrees